OSG Extension Tap: M20x1.5 Metric, D6 / 4H-6H, 4 Flute

An OSG extension tap is used to cut internal threads in hard-to-reach or deep-hole applications. The M20x1.5 metric size with a modified bottoming chamfer allows threading close to the bottom of a blind hole, making it ideal for maintenance, repair, and production across multiple materials.

This OSG extension tap has a M20x1.5 metric thread, D6 / 4H-6H tolerance, 4 flutes, and a modified bottoming chamfer. It is designed for multiple materials and comes with a spiral-flute geometry for efficient chip evacuation. The manufacturer part number is 1652008508.

3G Electric supplies OSG extension taps worldwide, handling full logistics and customs clearance for global delivery. As a sourcing partner across 14 industrial departments, we provide genuine OSG tooling like this M20x1.5 tap to customers in machining, maintenance, and production sectors.

Select an OSG extension tap based on thread size, pitch, and chamfer type. For blind holes, a modified bottoming chamfer like this M20x1.5 tap allows threading near the hole bottom. Match the tap tolerance (D6 / 4H-6H) to your required thread class and ensure the extension length reaches the depth needed.